Improvement in stave-machines



E.4 & l. HOBSNQV cpALEY-Bhsoml,

Stave-Mahines.

Patenfed Aug. 11,1874.

Jaw?,

WCBXME y known as band-saws.

UNITED STATES PATENT OFFICE.

CALVIN ALBEBTSON, IRA E. HOBSON, AND JOHN HOBSON, OF DALTON,

' IMPROVEMENT IN STAVE-MACHINES.

Specification forming part of Letters Patent No. 153,996, dated August l1, 1874 application liled February 26, 1874.

To all whom it may concern:

Be it known that we, CALVIN ALBERTSON,

IRA E. HoBsoN, and J oHN HoBsoN, of Dalton, in the county of Wayne and State of Indiana, have invented certain new and useful Improvements in Stave-Machines; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon, which form a f part of this specification.

y through the line so x, Fig. l.

- A represents the table of the machine, and B B are the two wheels over which the saw C passes,vsaid saw being of the kind usually The wheel B is attached to a shaft, a, mounted in suitable stationary bearings on the under side of the table A, and upon said shaft a is also attached a pulley, E, to which the power is applied for running the saw. The wheel B( is secured on a shaft, a', which is mounted in suitable bearings upon the under side of a slide, D, said slide being placed in suitable guides on the under side of the table A. By this means the wheel B may be adjusted out or in, as required, to compensate for the contraction and expansion of the band-saw, and thus keep the same always at the proper tension. Upon the under side of the slide D is arrack-bar, b, into which takes a pinion, e, on a shaft, d. This shaft is placed in suitable bearings on the under side of the table A, and has upon its front end a crankwheel, G, by means of which the shaft is turned to move the slide D and adjust the wheel B. Upon the edge of the wheel G are formed ratchet-teeth w, into which takes a pawl, f, for holding the wheel G, and through it the wheel B', at the point to which it has been set. From the top of the table A rise four posts, h h, arranged in pairs, two and two, and each pair connected at their upper ends by a cross-bar, H. In the cross-bars H H the journals of a head-block, I, have their bearings, and said cross-bars H are adjustable up and down upon theposts h bymeans of nuts fl, above and below the same, screwed upon the posts, whereby the head-block is adjusted for any size of stave and circle. Through a vertical slot in the head-block I passes a slide, J, to the lower end of which is attached a bar, K, running below and parallel with the headblock, and which has near each end a rod, k, .passing upward through the head-block and through a frame, m, attached to the Vupper side thereof, for the purpose of guiding and staying the bar K. At one end of the bar K is permanently attached a clamp, n, and upon the other end is placed a movable clamp, a', which is moved by means of a screw-shaft, p, as shown in Fig. l. Between these clamps the stave-block is held from'which the staves are to be cut. Upon one edge of the slide J are formed cogs y, meshing with a pinion, s, upon a shaft, tfwhich is held in suitable bearings attaehed to the head-block I, and provided at its front end with a crank or wheel, L, for turning it. By these means the staveblock is raised or lowered, as required, and it is held at the required points by means of a Uspring-pawl, c, taking into teeth z, formed in the opposite edge of the slide J. The saw G works longitudinally with the stave block, and when the latter has been set by the means just described the head-block is rocked on its journals, allowing the saw to cut oil' the stave. The head-block, rocking as described, causes the stave-block to describe a part of the circle, making the stavecoucave on one side and convex on the other. This circle is increased or diminished by the up-and-down adjustment of the head-block, as above set forth.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. The combination of the head-block I, carl rying the devices for holding the stave-block, the adjustable bars or boxes H H, in which the head-block rocks, and the posts h h, all substantially as and for the purposes herein set forth.

2. The movable bar K, provided with the guide-rods 7c k, stationary clamp n, adjustable clamp n', and screw-rod p, substantially as and for the purposes herein set forth.

3. The combination, with the rocking headblock I and the movable clamp-bar K, of the slide J, provided with cogs y and ratchetteeth z, the pinion s, shaft t, and the springpawl o, all substantially as and for Vthe purposes herein set forth.

In testimony that We claim the foregoing` as our own, We affix our signatures in presence of two Witnesses.

` CALVIN ALBERTSON.

IRA E. HOBSON. JOHN HOBSON.

Witnesses:

SAMUEL W. BEEsoN, J EssE CANADAY. 

